Hattusas, the capital of Hittite Empire which ruled in Anatolia for centuries, is in Boğazkale district and 80 km southwest of Çorum. A city called Hattus was located in here where Hatti people lived. When Hittites conquered the city, they converted name Hattus into their language as Hattusas or Hattusa. Hattusas stayed as the capital of Hittite Empire until the empire collapsed by the attacks of Thracian tribes in 1190.
The first walls of the city were built by King Hantili I in the early years of 16th century B.C. the first city was smaller than the current city. Total length of the city walls is 7 km. All the protected gates of the city (south, east and west) are decorated with reliefs. Yerkapı that gives a path through the southern walls, is also called Sphinx Gate because of the sphinx statues on either side. 71 meters long tunnel under the Sphinx Gate is opened to the city. A relief of Hittite King who was considered as a god is seen on the inner side of the King’s Gate which holds eastern wall gate. Lion statues depicted on the outer side of the Gate of Lions, which gives a path through the western walls, are the examples of Hittite art that survived till today. They were placed here to frighten evil spirits.
Official buildings, reception hall, achieve and emperor palaces were located in Büyükkale which formed the acropolis of the city in 14th and 13th centuries B.C. Remains dated to 7th and 6th centuries on the southern and southwestern slopes of the acropolis are from Phrygian period.
Many temple remains were discovered in the ancient city. The largest of these was built by Hattusilis III (1275-1250 B.C.) in the northwest end of the city. Structure which covers an area in size of 160 meters to 135 meters has more than eighty rooms. Tesup and Arinna, The storm god of Hittite blessed the sun goddess of Hepat in here.